Three main points of autumn management of pear trees:
1. Plastic pruning: The main function of autumn pruning of pear trees is to adjust the balance between growth and results, and promote the formation of robust fruiting branches and flower buds, and improve the ability of results. In order to stay strong and weak, the elimination of dead branches, diseased branches, excessive branches, long branches, etc., promote the ventilation and light transmission of fruit trees. The pruning mouth is applied to the callus anti-corrosion film in time, and the anti-pathogenic bacteria invade from the wound to promote the healing of the wound.
2, fertilizer and water management: timely application of nitrogen, phosphorus, potassium fertilizer, etc., to meet the growth needs of pear trees, to cultivate the strong results of the next year. The amount of fertilizer applied is determined according to the strength of the pear tree. The method of shallow ditch application is adopted, and the soil is applied after application to promote the effective utilization of nutrients. The amount of irrigation is determined at the discretion of the weather.
3. Disease prevention and control: The main diseases of pear trees include pear black spot disease, black spot disease, and round spot disease. The whole garden can be sprayed with tree guards to disinfect, and the virus is quenched in the germination stage to enhance pear tree resistance and immunity. Positive energy to protect the healthy growth of pear trees.
connecting sleeve seamless steel tube
| name | high quality hot rolled cold drawn steel square bar | |||
| material grade | q235,20cr,40cr | |||
| sizes range | 8mm-80mm | |||
| tolerance | 1-2% tolerance | |||
| length | 3m,5.8m or 6m | |||
| surface | black,bright | |||
| test |
squash test, extended test, water pressure test, crystal rot test, heat treatment, ndt |
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chemical composition |
chemical composition | q235 | 20# | 45# |
| c | 0.14~0.20% | 0.17~0.23 | 0.37~0.45 | |
| mn | 0.30~0.65 | 0.35~0.65 | 0.50~0.80 | |
| s | ≤0.050 | ≤0.035 | ≤0.035 | |
| p | ≤0.045 | ≤0.035 | ≤0.035 | |
| si | ≤0.30 | 0.17~0.37 | 0.17~0.37 | |
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mechanical properties |
tensile strength | 380~400 | ≥410 | ≥580 |
| yield strength | 235 | ≥245 | ≥335 | |
| extension | 26% | ≥25 | ≥19 | |
name: cold rolled hexagonal steel
cold rolled hexagonal steel packing:packing for export standard,plastic film and wooden case packing,etc
cold rolled hexagonal steel payment:l/c at sight or 40% advanced payment
cold rolled hexagonal steel delivery time:25-40 days
cold rolled hexagonal steel inspection:can do sgs inspection or other pre-shipment inspection
application:
1) stainless steel fasteners, chains, kitchen and sanitary wares
2) electronic products parts, medical appliances, springs
3) decoration materials and outdoor publictiy billboard, electron products
4) tablewares, bolts, nuts, screen meshs, cumbustors etc
Seamless Steel Pipe For Steel Bar Connecting Sleeve
connecting sleeve seamless steel tube
Liaocheng Xinglong Seamless Tube Manufacturing Co., Ltd. , https://www.lcxlpipe.com